Flame Touched (3.5e Equipment)
From D&D Wiki
A flame touched weapon seems to be composed entirely of flames though the wielder may hold it like a regular weapon. The weapon gains +4 fire damage and also half of its normal damage becomes fire damage instead. If the weapon has either the flaming ability or flaming burst ability, it deals an extra +2 fire damage per damage die the ability grants. As a move action, you may dissipate the blade of fire leaving only the handle. To relight it you must make a Use Magic Device check (DC 13) or use a command word.